org.eclipse.rdf4j.model.util

Interface GetStatementOptional

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface
public interface GetStatementOptional

Either supplies a statement matching the given pattern, or Optional.empty() otherwise.

Author:

Peter Ansell

Method Summary

Modifier and Type	Method and Description
Optional<Statement>	get(Resource subject, IRI predicate, Value object, Resource... contexts) Either supplies a statement matching the given pattern, or Optional.empty() otherwise.

Method Detail

get

Optional<Statement> get(Resource subject,
                        IRI predicate,
                        Value object,
                        Resource... contexts)

Either supplies a statement matching the given pattern, or Optional.empty() otherwise.

Parameters:

subject - A Resource to be used to match to statements.

predicate - An IRI to be used to match to statements.

object - A Value to be used to match to statements.

contexts - An array of context Resource objects, or left out (not null) to select from all contexts.

Returns:

An Optional either containing a single statement matching the pattern or Optional.empty() otherwise.